#aperture.hole  an opening in something
  supertype:  #hole.opening  an opening into or through something
  subtype:  #pupil  contractile aperture in the iris of the eye
  subtype:  #micropyle  minute opening in the wall of an ovule through which the pollen tube enters
  subtype:  #stoma.aperture__pore  a minute epidermal pore in a leaf or stem

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